android canvas.drawText让文字水平居中显示

在宽width高height的画布上画一字符串，使字符串水平水平居中：

水平居中很简单,paint.setTextAlign(Align.CENTER);然后drawText的x坐标设置为width / 2即可。代码如下：

 

paint.setColor(Color.WHITE);

paint.setTextSize(TEXT_SIZE * density);

paint.setAlpha(0x40);

paint.setTypeface(Typeface.create("System", Typeface.BOLD));

paint.setTextAlign(Paint.Align.CENTER);

canvas.drawText(getResources().getString(R.string.scan_text), width/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);